PB v RB & Ors [2016] EWCOP 12, a decision of District Judge Eldergill’s, merits note not because of its elucidation of any particular legal principles, but as a case study in the careful application of the s.4 principles in the context of a finely balanced decision relating to the long term care and residence of an elderly lady with dementia. Social and health care practitioners in particular could very usefully take the step by step discussion and application (at paragraphs 155-247) of each of the components of s.4 as a model of how to reach a best interests decision.